libbitcoin: fix gcc11 compilation by patch

pkgs/tools/misc/libbitcoin/fix-gcc11-compilation.patch

@@ -0,0 +1,12 @@
+diff --git a/include/bitcoin/bitcoin/wallet/dictionary.hpp b/include/bitcoin/bitcoin/wallet/dictionary.hpp
+index 632f1afc..63a51764 100644
+--- a/include/bitcoin/bitcoin/wallet/dictionary.hpp
++++ b/include/bitcoin/bitcoin/wallet/dictionary.hpp
+@@ -19,6 +19,7 @@
+ #ifndef LIBBITCOIN_WALLET_DICTIONARY_HPP
+ #define LIBBITCOIN_WALLET_DICTIONARY_HPP
+ 
++#include <cstddef>
+ #include <array>
+ #include <vector>
+ #include <bitcoin/bitcoin/compat.hpp>

pkgs/tools/misc/libbitcoin/libbitcoin.nix

@@ -21,6 +21,8 @@ in stdenv.mkDerivation {
 
   enableParallelBuilding = true;
 
+  patches = [ ./fix-gcc11-compilation.patch ];
+
   configureFlags = [
     "--with-tests=no"
     "--with-boost=${boost.dev}"